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Re:Wuhan lab staff sought hospital care before Covid-19 outb... by graeme on Sunday May 23, 2021 @09:18PM (#27260245)
SARS-COV-1 also used ACE2 receptors. In fact your article specifically discusses that, and suggests there was potential to use SARS-COV-1 vaccine development to create SARS-COV-2 vaccines.

The ACE2 receptor affinity is not novel.

Re:Wuhan lab staff sought hospital care before Covid-19 outb... by thowaway959125 on Sunday May 23, 2021 @09:24PM (#27260270)
Sort of. Very different without getting into the weeds.

https://www.nature.com/articles/s41392-020-0184-0